Carbureting system



April 25, 1933- c. E. HOFBAUER 1,905,712

' CARBURETING' SYSTEM Filed July 25, 1929 ,INVENTOR Patented Apr. 25, 1933 UNITED sTATES WENT CB i cAsPARn. HOFBAUER, onnnw YORK, n. Y., ssIGNoRro r Aiaounm ,cARBnRnToR CORPORATION, on vnw YORK, 1v; Y.,VA CORPORATION on NEW YORK C RBURETIN svs'rnm Application filed ul 2 5,

a lowerlevel is an example of the former;

Gravity feed from the main tank at a higher lever or from the vacuum tank of afuel feeding system or fuel pumps are examples of positive heads. i V a One of the objects of my invention is the provision of an arrangement which may take 5 the form of an attachment to "any of the fuel feeding systems now inuse which will eliminate the head and any variations thereof [as a varying factor in the control of fuel feeding systems, regardless of whether the headis a negative or a positive one.

While I have illustrated my invention. as

employed in connection with a'fuel feedsystern in which the fuel is lifted by engine suc- ,tion from a lower level, it will now be under- 5 stood and will later be pointed out that my invention is equally applicable regardless of the character 'of the fuel head. "For [example, it can be employed between the'vacuumi tank'and the'nozzle in a suction feed orfbe- 3'0 tween thegravity tank and the nozzle ina gravity feed. In accordance with the disclosure herein made, my invention takes the form of a valye with associated parts open and responsive to the action of the suction beyond the nozzle and also open to the fuel head whethernegative or positive and so constructed that the fuel head resolved thereby into twocomv ponents acting upon the valve in opposite directionsandto the same degree to thereby totally eliminate the fuel'hea'd as a'factor in controlling or in anyway affecting the opieration of the valve. v

Another object of the invention is the provision of an'arrangement that may take'the 1929. SerialNe. 380,857. 7

fuel feeding system.

form of an attachment to any present eiiisting For the attainment of the foregoing objects and such other objects as'may hereinafter appear 'orbe pointed out, I have illustrated one embodiment of myinventi'on in the accompanying drawing in which-- Thefi ure is a view partly in section and partly in elevation 'of'a system employing my invention. V i

The fuel .tanklO is illustrated as at a level below thenozzle l'loof the carburetor and the fuel is'lifted from this lower level to the nozzle engine suction. p a Wh'lethe'particular character of carburetorisnot partaof the present inventionyl will describe briefly the type of carburetor which I have illustrated in thedrawing;

The fuel [drawn through the nozzle 11 passes through the annular space 20 and through the passageway 21; centrally of the ve'nturi22 which is'open to the atmosphere at 23. The mixture is then dischargedinto the main casing by means. of the annular open- 'ing Q L'and then through the fitting 25 and 'also 'throughlthe bent tube 26, discharging centrallyjof the fitting 24. I .c

'30 is a primary 'air valve automatically controlled by. suction conditions thereabove to "give the required mixture. The arrangement'of'the contours of the-valve 30 and of the valveseatBIandof the wall 32adjacent thepvalve is an important feature of the carburetor arrangement herein. disclosed. It will be observed that thelower surface 33 of thevalve is conical and that the wall leading upwardly from the valve seat is also in the form of a truncated'cone, but at a steeper angle than the surface 33 0f thevalve'r Asa result of this arrangement suction action upon the a1r valve is maintained approximately constant regardless of theeXt-ent to which thevalve is raised from its seat.

U The fuel is lifted in theillustra-ted embodimentfromi the rear tank 10 to the nozzle 11 by a fuel feed line. My attachment is shown of a diaphragm'58 held in the illustrated embodiment as associated I erred or desired manner as for example by the fitting 42 threaded in the casing at one side. The line 44 to the nozzle is illustrated in the drawing as connected to the valve cas ing 40 at the opposite side by the fitting 45.

The casing is provided on its interior with a valve seat 46' to receive the valve 46 there'- on. This valve is provided. with the .upwardly directed stem 47 about which is received the spiral spring 48 having one end in abutting relation to the upper interior wall of the valve closure 41 and having its lower free end seated upon" the upper fiat surface of the valve. Directed oppositely from the valve-46 {is the stem 50 freely received in a'narrow channel 51in the lower half of the valve casing and passing through this channel. The lower end 52 0f thisfstem projects'into'the enlarged chamber '53 at the lower end of the valve casing.

The chamber 53 is still further enlarged to provide the shoulder 57 and the bottom of the casing is closed by the member 55, exceptfor the opening 56, by being threaded therein as shown and between thisclosure member 55 and the shoulder 57 is received the outer edge 7 V g in position against theshoulder 57 by'means of a washer 59. v V The diaphragm 58 is fixedly secured at its central portion to the lower-end of the: stem 50 in any desired or preferred manner and is made of any resilient or. yieldable gasoline I resistant material such as cellulose coated 'The pressure with which the valve 46 is normally maintained on the seat is: determined by the pressure applied to the sprin 48 and this in turn is controlled by threading the closure member 41 in or out as the case maybe. It is understood that the diaphragm shall be of a character that it assumes a position on either side of the normaljwithout being placed under tension and the material specifically mentioned herein is a material of this character; The pressure of the spring should normally be of a characterthat it will maintain the valve seated until a pressure is attained sufiicientto lift gasoline 36 inches, which is generally considered the maximum lift to whioha system of'this character will be subjected under normal running operations of an automobile. It will beunderstood,'of course, that the exact spring adjustment can be obtained by proper manipulation of theclosure '41 with the engine in running operation. Y

It is contemplated in accordance with my invention that the area of the diaphragm exposed to the action of the fuel head, that is, open to the interior of the casing 40, shall be approximately that of the valve head when seated. Upon viewing the drawing, it will be observed that, in effect, the exposed area of the diaphragm, has been made slightly larger than the area of the valve seat and this I have done so as to compensate for the inherent inertia of the diaphragm so that the actual effect of equal heads Will be to develop equal pressures.

Upon viewing the drawing, it will beobserved that the line 44 to the nozzle is open to the valve casing at a point above the valve seatandthat the line to the fuel tank 10 is open to the valve casing at a point below the valve seat and iiiter'mediately of the valve seatlandthe diaphragm 58. .This is a very important feature of my invention for reasons which 'will'now'be pointed out. The valve will necessarily be controlled by and be responsive to the suction conditions in line" 44 which is the line to the nozzle. The

tially the same as the diaphragm area open to the same fuel head, the action of the fuel head .is in effect resolved into an upward pressure. directly on the valve head and an equal downward pressure thereon through the diaphragm 58 and the connecting stem 50(so'that, as these two components are substantially equal and in opposite directions, they negative each other and the efiec't of the fuel head on the valve head is eliminated absolutely as a factor and it can therefore be said that the valve is in no way affected or controlled by the fuel head either whether negative or positive or whether changing from one to the other, or increasing as to oneor the other. i v, e l

It 'rwill be observed that the diaphragm 58 isopen at its'lower surface to atmospheric I pressure through the opening V 56 so aslto eliminate any varying factor in the function ing of the diaphragm. I a V One of theessential features of this phase of mylinvention is that the fuel head is caused to operate to equal degrees" and in opposite directions upon thevalve and its connected parts and while I have illustrated in the drawing the employment with the valve of a diaphragm, it will be understood that other acted upon by the fuel head oppositely to the action of the fuel head upon the valve, will attainthe purpose of my invention.

The description thus far givenof my attachment has been in connection with a suction feed from a lower level. Ihere may be conditions under which the automobile due to its position on a hill may convert the system into a gravity system. In such an event 7 the head will have become a positive one and will be eliminated by the equal pressure developed on the valve in opposite directions just as has been described in connection with a feed from a lower level tank. It will also the member for connection to the conduit to the fuel source whereby the action of the I headof the fuel from the source of supply upon the valve and the member and therefore upon the valve will be substantially equal and opposite, thus eliminating this head as a factor in the operation of the fuel feed control. d

In witness whereof I have signed and sealed this specification this 22 day of July,

' GASPAR E; HOFBAUER.

rangement can be employed at any point in r the system and regardless of the character of the feed at that particular point of the system, its use will render unnecessary any other arrangements heretofore devised for controlling the fuel head and its variations. W

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patents is 1. As an attachment to a fuel feed system I for automobiles and the like, a valve chamber, a valve seat therein, avalve, means acting automatically to keep said valve on its seat, a diaphragm supported in said chamber in spaced relation to said valve and connected thereto and presenting an area'open to the chamber substantiallyequal to the area of the valve open to the chamber, a the valve chamber being open to one side of the valve seat for connection of the conduit to the fuel nozzle and on the opposite side of the valve seat and at a point between the valve seat and the diaphragm for connection to the conduit to the fuel source whereby the action of the head of the fuel from the source of supply upon the valve and the diaphragm and therefore upon thevalve will be substantially equal and opposite, thus eliminating this head as a factor in the operation of the fuel feed control.

2. As an attachment to a fuel feed system for automobiles and the like, a valve chamber, a valve seat therein, a valve, means act-= ing automatically to keep said valve on its seat, a member supported in said chamber in spaced relation to said valve and connecti ed thereto and presenting an area open to the chamber substantially equal to the area of the valve open to the chamber, the valve chamber being open to one side of the valve seat for connection of the conduit to the fuel nozzle on the opposite side of the valve seat and at a point between the valve seat and 

